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Bosch dishwasher won't drain

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I came home to find two things 1. Burned electrical smell in the house 2. Dishwasher had failed to drain

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  #1 (permalink)  
Old 07-01-2008, 05:29 PM
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Default Bosch dishwasher won't drain
Model Number: SHU33A06/22   Brand: Bosch   Age: 1 - 5 years   

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I came home to find two things
1. Burned electrical smell in the house
2. Dishwasher had failed to drain

I cannot tell for sure if the two are connected, but it seems likely.

The filters were not clogged, and the drain impeller does not appear to be clogged. I find the impeller does not spin freely - it resists then moves in jerks. Kind of like turning a piston-driven shaft if you know what I mean.

I tried using the posted online manual to ohm-out the drain motor from the front panel, but the schematic for the SHU 33 does not appear to match mine (SHU33A06/22).

Suggestions?


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  #2 (permalink)  
Old 07-02-2008, 03:04 PM
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What it does when you push any buttons? Lights, sounds, e.t.c. ?

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Old 07-02-2008, 06:46 PM
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Well that was interesting.

Yesterday it would run through a cycle like normal until it needed to drain, then made switching noises like it was trying to do something but could not. Eventually it appeared to be done (based on the lights) but the tub was full of water. I removed and cleaned all filters, which were not bad. Removed the pump cover and checked the impeller was not obstructed. Checked that the drain hose was not plugged.
Today, to answery your query precisely, I ran it through a cycle... and it worked fine. Running another cycle now, so we'll see.
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Old 07-04-2008, 05:58 PM
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After three cycles with no problem, it's back to leaving the tub full of water. Seems to run through normally, but the tub is full of water at the end.
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Old 07-05-2008, 05:16 PM
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Possible a foreign object fluctuating in the drain line.

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Old 11-29-2008, 08:17 PM
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Still no solution.
Symptoms:
- Burned electrical smell during cycle
- Tub is full of water at the end

What I've done:
Verified drain lines are clear
Verified drain hose has proper loop
Removed and inspected the circuit board - looks okay.
Replaced the drain pump.
- Old pump appears to be fine, after removal
- It ran two cycles normally after replacing the pump, then back to the
same failure mode.

Any troubleshooting suggestions?
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